This course is the key to success for students in University or Institute and professionals in the fields of electricity. Many branches of electrical engineering, such as power, electric machines, control, electronics, communications, and instrumentation, are based on electric circuit theory. Therefore, the basic electric circuit theory course is the most important course for an electrical, electronical and IT engineering student, and always an excellent starting point for a beginning student in electrical engineering field education. Circuit theory is also valuable to students specializing in other branches of the physical sciences because circuits are a good model for the study of energy systems in general. The entire course is valuable as it contains all the concepts DC & AC (1 and 3 Phase) circuits. With simple and easy to understand explanations and simulations, the course is more practical, dynamic, comprehensive, and presented in the following methodologies: Lectures with video presentations and attachments. High quality digital handwritten content. Examples, simulations and tutorials using Multisim. Quiz, practice tests and assignments. The part 1 of the course is divided in 7 sections: Course OverviewIntroduction and course structure. Fundamental ConceptsElectrical circuit and its composition. Basic circuit elements. Electrical quantities and principles. Resistor, cell and battery internal composition. Points basic operations: movement and short-circuit. Circuit basis: branches, nodes and loops. Linear Direct Current Circuit ConceptsBasic circuit connections: series and parallel. Complementary circuit connections: delta to wye and wye to delta transformation. Examples 1 & 2: equivalent resistance calculation for complex circuits. Example 3: proof of the transformation from wye to delta and vice versa. Example 4: calculation of total current in equivalent circuit of example 2.Example 5: simplification of a complex circuit. Voltage and current sources association: series and parallel. Example 6: sources association equivalent voltage and current calculation. Virtual Lab Using MultisimIntroduction to simulation software. Simulation of total resistance between points. Simulation of equivalent voltage and current for sources association. Calculation Methods for Complex DC CircuitsKirchhoff’s laws. Example 7 & 8: application of Kirchhoff’s laws in circuit analysis. Current and voltage divider. Superposition. Nodal analysis. Independent mesh current analysis. Thevenin theorem. Norton theorem. Power balance calculation. Calculation Methods for Complex DC Circuits ExamDC circuit analysis exam. Final ConsiderationsContact for support. What the student can expect from instructor?Clear in explaining theories and practical exercisesAvailable to clarify doubts and explanations about specific course contentPractical examples of the application of circuit analysis in EE employmentIn the end, the student will be able to solve complex circuits and understand all future lessons in electricity field.